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Finding the Fourth Proportional to 205.75, 283.90 and 122.85

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Solution

The fourth proportional to 205.75, 283.90 and 122.85 is: 169.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.75 : 283.90 = 122.85 : x
  2. Step 2: Convert to fraction form
    205.75/283.90 = 122.85/x
  3. Step 3: Cross multiply
    205.75x = 283.90 × 122.85
  4. Step 4: Simplify right side
    205.75x = 34,877.12
  5. Step 5: Solve for x
    x = 34,877.12/205.75
  6. Step 6: Final answer
    x = 169.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.